<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
        class="page-nav-bar"
        left-arrow
        title="黑马头条"
    >
      <template #left>
        <van-icon name="arrow-left" color="#fff" @click="$router.back()"/>
      </template>
    </van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isLoading">
        <van-loading
            color="#3296fa"
            vertical
        >加载中
        </van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.art_id">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
              class="avatar"
              slot="icon"
              round
              fit="cover"
              :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | formatDate }}</div>

          <!--          <FollowUser :isFollowed="article.is_followed" :aut_id="this.article.aut_id"></FollowUser>-->
          <FollowUser v-model="article.is_followed" :aut_id="this.article.aut_id"></FollowUser>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body"
             v-html="article.content"
             ref="content">
        </div>
        <van-divider>
          正文结束
        </van-divider>
        <CommentList @clickReply="onClickReply"
                     :list="list"
                     :source="article.art_id"
                     @updateTotalCount="total_count=$event"></CommentList>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="is404">
        <van-icon name="failure"/>
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure"/>
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticleInfo">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if="article.art_id">
      <van-button
          class="comment-btn"
          type="default"
          round
          size="small"
          @click="popupShow=true"
      >写评论
      </van-button>
      <van-icon
          name="comment-o"
          :badge="total_count"
          color="#777"
      />
      <!--      收藏图标-->
      <ArticleCollected v-model="article.is_collected" :artId="article.art_id"></ArticleCollected>

      <van-icon
          color="#777"
          name="good-job-o"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
    <!--   评论 弹出层-->
    <van-popup v-model="popupShow" position="bottom">
      <CommentPost @updatecomment="list.unshift($event)"
                   :target="articleId"
                   @onPostSend="popupShow=false"></CommentPost>
    </van-popup>
    <van-popup v-model="isReplyShowComment"
               style="height: 100%"
               position="bottom">
      <CommentReply :comment="comment"
                    v-if="isReplyShowComment"
                    @back="isReplyShowComment=false"></CommentReply>
    </van-popup>
  </div>
</template>
<script>
import { getArticleDetail } from '@/api/article'
import { ImagePreview } from 'vant'
import './github-markdown.css'
import FollowUser from '@/components/FollowUser'
import ArticleCollected from '@/components/ArticleCollected'
import CommentList from '@/components/CommentList'
import CommentPost from './components/commentPost'
import CommentReply from '@/views/Article/components/CommentReply'

export default {
  name: 'Article',
  components: {
    FollowUser,
    ArticleCollected,
    CommentList,
    CommentPost, // 发布评论
    CommentReply
  },
  props: {
    articleId: {
      type: String,
      required: true
    }
  },
  data () {
    return {
      list: [],
      article: {},
      isLoading: true,
      is404: false,
      total_count: 0,
      popupShow: false, // 评论弹出层
      isReplyShowComment: false,
      comment: {}
    }
  },
  created () {
    this.loadArticleInfo()
  },
  methods: {
    // 点击评论里边的回复
    onClickReply (e) {
      this.comment = e
      this.isReplyShowComment = true
    },
    async loadArticleInfo () {
      this.isLoading = true
      try {
        this.article = await getArticleDetail(this.articleId)
        this.isLoading = false
        this.$nextTick(() => {
          this.previewPicture()
        })
      } catch (e) {
        this.isLoading = false
        if (e.response && e.response.status === 404) {
          this.is404 = true
        }
      }
    },
    // 预览图片
    previewPicture () {
      const imgs = this.$refs.content && this.$refs.content.querySelectorAll('img')
      const imgsArr = []
      imgs.forEach((item, index) => {
        imgsArr.push(item.src)
        item.onclick = function () {
          console.log(index)
          ImagePreview({
            images: imgsArr,
            startPosition: index
          })
        }
      })
    }
    // 关注
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }

  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;

      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }

      .van-cell__label {
        margin-top: 0;
      }

      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }

      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }

      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;

      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;

    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }

    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }

    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;

    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }

    .van-icon {
      font-size: 40px;

      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
